<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    position: fixed;
    position: absolute;
  </style>
  <link rel="stylesheet" href="./css/test.css">
</head>

<body>
  <div class="box">
    我是一个测试的盒子。html代码检查。
  </div>
  <p>杨方涛</p>
  <span>测试</span>
</body>

</html>